docs: def _select_basin_model(self, vs30):
          """
          Select the preferred basin model (California or Japan) to scale
          basin depth with respect to Vs30
          """
          if self.CONSTS["SJ"]:
              # Japan Basin Model - Equation 34 of Campbell & Bozorgnia (2014)
              return np.exp(5.359 - 1.102 * np.log(vs30))
          else:
              # California Basin Model - Equation 33 of
              # Campbell & Bozorgnia (2014)
              return np.exp(7.089 - 1.144 * np.log(vs30))